BIIB — BIOGEN INC.Today's name, from the SEC's present-day ticker list — a present-day mapping, not the name as of each filing.

Congress trades
94
all time
Members · 12m
4
6 buys · 3 sells · by trade date
Latest filing
10-07
2026-10-07
Rows filed past the STOCK Act's 45-day window, stated on the row, never editorialised; both dates and the receipt stay on every row.
14
13F holders
788
top 500 listed · 2026-03-31
Congress: statutory ranges, filed up to 45 days after the trade · 13F: quarter-end snapshots, filed up to 45 days lateras of 2026-10-29

On Signals

ACTIVE HITS NAMING BIIB · NEWEST FILED FIRST · EVERY HIT CARRIES ITS RECEIPTSignals ↗
Active signal hits naming BIIB, newest filed first
KindWhoTraded → FiledSizeSrc
first disclosure of this ticker by this member within the corpus — era-scoped: coverage begins 2014-01-03, so an earlier first disclosure cannot be seen and is not claimed againstHernTraded → Filed +14d$1.0K–$15.0K

1–1 of 1 line · 1 hit · each kind word opens its exact rule · every hit is in signals.v1.json.

Congress 94Institutional 500

Congress · disclosure timeline

By trade date · 24 months · 12 rows ▲ buy, ▼ sell; height = lower bound (log scale); ringed = on Signals. Trade date, not filing date — the filing lag is in the table below.

12 dated disclosures in the window, placed by trade date; magnitudes are the disclosed lower bounds, against gridlines at $15K, $250K, $5M; 1 ringed mark is a line of the Signals row above, pinned in the table below.

Members active in BIIB

12 months · most active first Rows = number of disclosures, not dollars. Net = lower bound of the net range. Committees as of each member's latest trade in the window (roster snapshot 2026-10-29).
Members disclosing BIIB in the trailing 12 months
MemberRowsNet disclosed flow for this ticker: purchases minus sales, computed as a net range on the disclosed amounts. A lower bound is provable, never a point.Number of committees the member sat on as of their latest trade date in the window, from the cc0-legislators roster snapshot. Context, never an allegation; jurisdiction overlap needs the sector join.
Maria Elvira Salazar R–FL-275−$13.0K to $114K2
Gilbert Ray Cisneros, Jr. D–CA-312$2.0K to $30.0K2
Alan Armstrong R–OK1$1.0K to $15.0K2
Kevin Hern R–OK-11−$15.0K to −$1.0K1

4 members

Congressional disclosures

Signals rows first, then newestAll 94 rows ↗
Latest congressional filings mentioning BIIB, the rows on Signals first
FiledMemberSide · OwnerTraded · LagAmountRange · FlagsSrc
2026-09-01Kevin Hern R–OK-1 On SignalsSELLTraded 08-18 +14d$1K–$15K
2026-10-07Maria Elvira Salazar R–FL-27SELL partial (partial sale)Traded 09-24 +13d$1K–$15K
2026-07-21Alan Armstrong R–OKBUYTraded 03-27 LATE·116d$1K–$15K
2026-07-07Maria Elvira Salazar R–FL-27SELLTraded 06-02 +35d$15K–$50K
2026-07-02Gilbert Ray Cisneros, Jr. D–CA-31BUYTraded 06-05 +27d$1K–$15K
2026-06-08Maria Elvira Salazar R–FL-27BUYTraded 05-12 +27d$1K–$15K
2026-06-08Maria Elvira Salazar R–FL-27BUYTraded 05-11 +28d$1K–$15K
2026-06-08Maria Elvira Salazar R–FL-27BUYTraded 05-11 +28d$50K–$100K
2026-02-13Gilbert Ray Cisneros, Jr. D–CA-31BUYTraded 01-30 +14d$1K–$15K
2025-06-09Robert P. Bresnahan, Jr. R–PA-8BUYTraded 05-15 +25d$1K–$15K

13F holders · Quarter ended 2026-03-31Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt. · longs only

All holders ↗
Top institutional holders of BIIB for quarter 2026-03-31, 1–25 of 788 holders
#FilerValueSecuritiesFlagsderived by Public Filings from this build's reviewed ticker-mapping holders list for this share class; that list carries each holder's share count, share change and filed date (the full holders view shows them), but no document links — the EDGAR link opens the filer's 13F list·§
1BlackRock, Inc.$2.9B1
derived ·§ EDGAR ↗
2PRIMECAP MANAGEMENT CO/CA/$2.7B1
derived ·§ EDGAR ↗
3FMR LLC$2.3B1
derived ·§ EDGAR ↗
4VANGUARD CAPITAL MANAGEMENT LLC$1.7B1
derived ·§ EDGAR ↗
5STATE STREET CORP$1.3B1
derived ·§ EDGAR ↗
6VANGUARD PORTFOLIO MANAGEMENT LLC$1.2B1
derived ·§ EDGAR ↗
7GEODE CAPITAL MANAGEMENT, LLC$793M1
derived ·§ EDGAR ↗
8WELLINGTON MANAGEMENT GROUP LLP$543M1
derived ·§ EDGAR ↗
9MORGAN STANLEY$398M1
derived ·§ EDGAR ↗
10AQR CAPITAL MANAGEMENT LLC$346M1
derived ·§ EDGAR ↗
11Invesco Ltd.$320M1
derived ·§ EDGAR ↗
12Boston Partners$312M1
derived ·§ EDGAR ↗
13NORTHERN TRUST CORP$265M1
derived ·§ EDGAR ↗
14UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$253M1
derived ·§ EDGAR ↗
15Legal & General Group Plc$247M1
derived ·§ EDGAR ↗
16BANK OF AMERICA CORP /DE/$212M1
derived ·§ EDGAR ↗
17CHARLES SCHWAB INVESTMENT MANAGEMENT INC$211M1
derived ·§ EDGAR ↗
18DIMENSIONAL FUND ADVISORS LP$198M1
derived ·§ EDGAR ↗
19DEUTSCHE BANK AG\$195M1
derived ·§ EDGAR ↗
20Pictet Asset Management Holding SA$168M1
derived ·§ EDGAR ↗
21VANGUARD FIDUCIARY TRUST CO$151M1
derived ·§ EDGAR ↗
22Point72 Asset Management, L.P.$148M1
derived ·§ EDGAR ↗
23Alyeska Investment Group, L.P.$148M1
derived ·§ EDGAR ↗
24Amundi$145M1
derived ·§ EDGAR ↗
25Bank of New York Mellon Corp$145M1
derived ·§ EDGAR ↗
Show the top 500 of 788 holders
Truncated by Public Filings. Top 500 of 788 holders shown; the rest are on EDGAR. Method ↗

Crowding — not available in this build. No holder rows for the selected period, so no percentile can be ranked.

Congress ↔ notable managers · BIIB

Congress · last 90 days

Buyers
0 — —
Sellers
2 Kevin Hern R–OK-1, Maria Elvira Salazar R–FL-27 $2K–$30K

filed 2026-07-31 → 2026-10-29 · statutory ranges

Notable managers · quarter ended 2026-03-31

Adding
1 Gotham Asset Management $54.7M held
Trimming
1 Glenview Capital $10.5M held

by shares · $ = value heldNEW + ADD vs TRIM + EXIT, by share count. $ = reported value now, not the change. · BIOGEN INC

Merged timeline of congressional filings and notable-manager moves on BIIB
DateWhoChangeSize
2026-10-07Maria Elvira Salazar CongressSELL$1K–$15K
2026-09-01Kevin Hern CongressSELL$1K–$15K
2026-05-15Gotham Asset Management 13FADD+21,628 sh
2026-05-15Glenview Capital 13FTRIM−233,586 sh

4 newest, by filing date · 13F rows are quarter-end snapshots, not trades

Congress vs filers

12 months
Congress net (rows)6 buy / 3 sell
Congress net ($ bound)−$25.0K to $158K
Filersnot computedThe filer side needs per-issuer quarter-over-quarter actions, which the published aggregate does not carry for this issuer. Convergence and divergence are stated only when both sides are computed.